A Pen by Dirk van Oosterbosch on CodePen.
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September 4, 2020 14:43
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Contrast Color
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| <html> | |
| <head> | |
| </head> | |
| <body> | |
| <div class="wrap"> | |
| <h1 class="title">Contrast Color</h1> | |
| <div id="palette"></div> | |
| </div> | |
| </body> | |
| </html> |
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| // c is a tiny color object | |
| function contrast_color(c) { | |
| let dark = "#000" | |
| let light = "#fff" | |
| let hsv = c.toHsv() | |
| let stops = [ | |
| {h: 0, s: 1.0}, | |
| {h: 30, s: 0.4}, | |
| {h: 45, s: 0.2}, | |
| {h: 60, s: 0.1}, | |
| {h: 90, s: 0.2}, | |
| {h: 120, s: 0.5}, | |
| {h: 135, s: 0.55}, | |
| {h: 180, s: 0.4}, | |
| {h: 215, s: 0.8}, | |
| {h: 240, s: 1.6}, | |
| {h: 300, s: 0.8}, | |
| {h: 360, s: 1.0}, | |
| ] | |
| for (let i = 0; i < stops.length - 1; i++) { | |
| let stop = stops[i] | |
| let next = stops[i + 1] | |
| if (hsv.h < next.h) { | |
| let ds = next.s - stop.s | |
| let h = (hsv.h - stop.h) / (next.h - stop.h) | |
| let linear = h * ds | |
| return ((-hsv.s * (stop.s + (h * ds))) + hsv.v > 0.5) ? dark : light | |
| } | |
| } | |
| // Default | |
| return (hsv.v > 0.5) ? dark : light | |
| } | |
| var satSlider = 1.0 | |
| var gridContent = "" | |
| for (let val = -100; val < 100; val += 5) { | |
| gridContent += '<div class="row">' | |
| for (let hue = 0; hue < 360; hue += 5) { | |
| let sat = (val < 0 ? 100 + val : 100) * satSlider | |
| let v = val > 0 ? 100 - val : 100 | |
| let col = tinycolor({ h: hue, s: sat, v: v }) | |
| let concol = contrast_color(col) | |
| gridContent += '<span class="swatch" style="background-color: ' + col.toHexString() + '"><div class="inner" style="color: ' + concol + '">•</div></span>' | |
| } | |
| gridContent += '</div>' | |
| } | |
| palette.innerHTML = gridContent |
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| <script src="https://cdnjs.cloudflare.com/ajax/libs/tinycolor/1.4.1/tinycolor.min.js"></script> |
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| body { | |
| color: #fff; | |
| background: #171F30; | |
| line-height: 150%; | |
| } | |
| .wrap { | |
| min-height: 100vh; | |
| max-width: 840px; | |
| margin: 0 auto; | |
| /* display: flex; | |
| flex-direction: row; */ | |
| align-items: center; | |
| justify-content: center; | |
| .half { | |
| width: 50%; | |
| padding: 32px 0; | |
| } | |
| } | |
| .title { | |
| font-family: sans-serif; | |
| line-height: 24px; | |
| display: block; | |
| padding: 8px 0; | |
| } | |
| .readout { | |
| margin-top: 32px; | |
| line-height: 180%; | |
| } | |
| #palette { | |
| display: block; | |
| } | |
| .swatch { | |
| width: 10px; | |
| height: 10px; | |
| display: inline-block; | |
| } | |
| .inner { | |
| font-size: 80%; | |
| margin-top: -6px; | |
| margin-left: 3px; | |
| } | |
| .row { | |
| height: 10px; | |
| display: block; | |
| } |
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